L6728H Datasheet, PDF (1/32 Pages) STMicroelectronics – Single phase PWM controller with Power Good

L6728H
Single phase PWM controller with Power Good
Features
■ Flexible power supply from 5 V to 12 V
■ Power conversion input as low as 1.5 V
■ 0.8 V internal reference
■ 0.8% output voltage accuracy
■ High-current integrated drivers
■ Power Good output
) ^{■ Sensorless and programmable OCP across}
t(s ^{low-side RDS(on)}
c ^{■ OV / UV protections}
u _{■ VSEN disconnection protection}
rod ^{■ Oscillator internally fixed at 300 kHz}
P ■ LSless to manage pre-bias start-up
te ^{■ Adjustable output voltage}
le ■ Disable function
o _{■ Internal soft-start}
bs _{■ DFN10 package}
t(s) ^{- O Applications}
uc ^{■ Memory and termination supply}
d _{■ Subsystem power supply (MCH, IOCH, PCI...)}
ro _{■ CPU and DSP power supply}
P _{■ Distributed power supply}
Obsolete ^{■ General DC-DC converters}
DFN10
Description
L6728H is a single-phase step-down controller
with integrated high-current drivers that provides
complete control logic and protection to realize in
a simple way general DC-DC converters by using
a compact DFN10 package.
Device flexibility allows managing conversions
with power input V_IN as low as 1.5 V and device
supply voltage ranging from 5 V to 12 V.
L6728H provides simple control loop with voltage
mode EA. The integrated 0.8 V reference allows
regulating output voltages with ±0.8% accuracy
over line and temperature variations. Oscillator is
internally fixed to 300 kHz.
L6728H provides programmable dual level over
current protection as well as over and under
voltage protection. Current information is
monitored across the low-side MOSFET R_DS(on)
saving the use of expensive and space-
consuming sense resistors.
PGOOD output easily provides real-time
information on output voltage status, through
VSEN dedicated output monitor.
Table 1.
Device summary
Order codes
L6728H
L6728HTR
Package
DFN10
Packaging
Tube
Tape and reel
May 2009
Doc ID 15725 Rev 1
1/32
www.st.com
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